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Renesas RD33ES-T4-AZ
- Part No.:
- RD33ES-T4-AZ
- Manufacturer:
- Renesas
- Category:
- Single Zener Diodes
- Package:
- -
- Datasheet:
-
RD33ES-T4-AZ.pdf
- Description:
- DIODE ZENER
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
RD33ES-T4-AZ from Excel Semiconductor is a DO-34 glass-sealed Zener diode with nominal zener voltage 33.11 V (typical), dynamic impedance 65 Ω at 5 mA, and maximum power dissipation of 400 mW. It operates within -65°C to +175°C storage range and serves as a precision voltage reference or surge absorber in low-power analog circuits.
For engineers reviewing the RD33ES-T4-AZ datasheet, RD33ES-T4-AZ pinout, RD33ES-T4-AZ application, or RD33ES-T4-AZ equivalent, key selection criteria include its 33.11 V zener voltage tolerance (±5%), 65 Ω dynamic impedance at 5 mA test current, 0.2 μA reverse leakage at 25 V, and DO-34 axial glass package compatibility with 5 mm PCB pitch insertion.
Technical Context
This Zener diode uses planar process technology to ensure stable breakdown characteristics and tight E24-standard voltage grading. Its 33.11 V nominal zener voltage is specified at 5 mA test current, with knee impedance ≤250 Ω at 0.5 mA and temperature coefficient optimized for mid-voltage regulation.
The device supports transient surge absorption up to 100 W peak reverse power and maintains reliable operation across junction temperatures from -65°C to +175°C. Its DO-34 glass package provides hermetic sealing and thermal performance validated per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Vz) | 31.49–33.11 V at 5 mA - defines regulated output voltage range under standard bias |
| Dynamic Impedance (Zzt) | 65 Ω max at 5 mA - determines voltage regulation stiffness against load current variation |
| Knee Impedance (Zzk) | 250 Ω max at 0.5 mA - indicates onset of stable breakdown behavior near threshold current |
| Reverse Leakage (IR) | 0.2 μA max at 25 V - ensures minimal standby power loss in high-impedance bias networks |
| Power Dissipation (Pv) | 400 mW - sets maximum continuous DC power handling at 25°C ambient |
| Surge Reverse Power (PRSM) | 100 W - enables short-duration transient suppression without failure |
| Junction Temperature (Tj) | -65°C to +175°C - supports operation in extended industrial and automotive environments |
Pinout & Package
RD33ES-T4-AZ is housed in a DO-34 glass axial package with cathode identified by a band. The device has two terminals: anode and cathode. No internal circuitry or multi-pin configuration applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower potential side in reverse-biased Zener operation |
| Cathode | Zener breakdown terminal | Banded end; connected to higher potential side to enable voltage regulation |
Key Features
| Feature | Design Value |
|---|---|
| DO-34 glass sealed package | Enables manual or automated through-hole insertion with 5 mm pitch compatibility on PCBs |
| Planar process construction | Delivers consistent breakdown voltage distribution and improved long-term stability vs. diffused junctions |
| E24-standard zener voltage grading | Ensures predictable voltage selection across 24 values per decade for design flexibility |
| 175°C maximum junction temperature | Supports reliable operation in high-temperature industrial control and power supply monitoring |
| 100 W surge reverse power rating | Provides robust transient overvoltage protection without external clamping components |
Applications
| Voltage Reference Circuit | Overvoltage Protection |
|---|---|
Use Scenario: Stable 33 V reference for ADC biasing or op-amp feedback networks in sensor signal conditioning. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to fix reference node voltage. Use Value: 65 Ω dynamic impedance ensures <±10 mV shift under ±1 mA load variation at 5 mA bias. |
Use Scenario: Clamping input lines exposed to ESD or inductive kickback in PLC I/O modules. IC Role / Device Role / Timing Role: Passive voltage clamp absorbing transients above 33 V threshold. Use Value: 100 W surge rating handles 8/20 μs pulses up to 10 A without degradation. |
| Waveform Clipping | Constant Current Source |
Use Scenario: Limiting audio signal peaks in analog preamplifier stages to prevent distortion. IC Role / Device Role / Timing Role: Bidirectional clipping element using forward and reverse conduction paths. Use Value: 0.7 V forward drop and 33.11 V reverse breakdown define precise symmetrical clipping thresholds. |
Use Scenario: Setting bias current for LED drivers or transistor amplifiers via series resistor + Zener. IC Role / Device Role / Timing Role: Voltage reference establishing fixed voltage drop across current-setting resistor. Use Value: 0.2 μA leakage at 25 V minimizes error in sub-100 μA constant current designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5261B | 33 V nominal, 70 Ω Zzt at 5 mA, DO-35 package, 500 mW rating | Higher power rating but larger DO-35 footprint; less suitable for 5 mm pitch layouts | Choose when higher continuous power margin is required and board space allows DO-35 |
| BZX55C33 | 33 V nominal, 80 Ω Zzt at 5 mA, DO-35 package, 500 mW rating, ±5% tolerance | Same voltage grade but higher dynamic impedance and different thermal profile | Prefer for legacy BOM alignment where DO-35 is already standardized |
Compared with 1N5261B and BZX55C33, RD33ES-T4-AZ offers tighter DO-34 mechanical fit for compact 5 mm pitch assemblies, lower dynamic impedance for improved regulation, and verified 100 W surge capability-making it optimal for space-constrained industrial voltage references and transient clamps.
Availability
RD33ES-T4-AZ is available at Aetrix Electronics and suitable for voltage reference circuits, overvoltage protection systems, and waveform clipping applications requiring stable component supply and consistent Zener characteristics across production batches.
Supply support for RD33ES-T4-AZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Excel Semiconductor is a China-based analog semiconductor manufacturer specializing in discrete protection and regulation devices, with focus on Zener diodes, TVS arrays, and ESD suppressors.
RD33ES-T4-AZ belongs to the RD2.0ES–RD39ES Zener diode family designed for precision voltage regulation and transient suppression in industrial power supplies, instrumentation, and control systems.
FAQ
What is the exact zener voltage range for RD33ES-T4-AZ?
The RD33ES-T4-AZ has a guaranteed zener voltage range of 31.49 V to 33.11 V when tested at 5 mA reverse current and 25°C junction temperature. This range reflects the device's E24-standard grading and accounts for manufacturing tolerances confirmed in the Rev. 3e datasheet.
Does RD33ES-T4-AZ support high-temperature operation?
Yes, RD33ES-T4-AZ is rated for junction temperatures from -65°C to +175°C and storage temperatures across the same range. Its DO-34 glass package and planar construction maintain parameter stability under sustained thermal stress, making RD33ES-T4-AZ suitable for under-hood automotive sensors and industrial motor drives.
What is the maximum surge power RD33ES-T4-AZ can withstand?
RD33ES-T4-AZ is rated for 100 W peak surge reverse power (PRSM) under defined pulse conditions. This capability enables RD33ES-T4-AZ to absorb transient overvoltages such as ESD events or inductive switching spikes without permanent degradation, provided pulse width and repetition rate remain within datasheet limits.
How does the dynamic impedance of RD33ES-T4-AZ affect regulation accuracy?
With a maximum dynamic impedance (Zzt) of 65 Ω at 5 mA, RD33ES-T4-AZ exhibits low sensitivity to load current changes-resulting in <±10 mV output variation for ±1 mA load shifts. This makes RD33ES-T4-AZ well-suited for precision biasing where stable reference voltage is critical.
Is RD33ES-T4-AZ compatible with automated through-hole assembly?
Yes, RD33ES-T4-AZ uses the JEDEC-standard DO-34 axial glass package with 29 mm body length and 1.8 mm diameter, designed explicitly for wave soldering and pick-and-place insertion. Its 5 mm pitch compatibility ensures seamless integration into automated PCB assembly lines using standard DO-34 tooling.
RD33ES-T4-AZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- -
- Tolerance:
- -
- Power - Max:
- -
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- -
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
RD33ES-T4-AZ FAQ
1.How can I place an order for RD33ES-T4-AZ through Aetrix?
Please submit a Request for Quotation (RFQ) for RD33ES-T4-AZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for RD33ES-T4-AZ reliable?
The price and inventory of RD33ES-T4-AZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RD33ES-T4-AZ is usually 5 days.
3.What payment methods are accepted for RD33ES-T4-AZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RD33ES-T4-AZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RD33ES-T4-AZ?
RD33ES-T4-AZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RD33ES-T4-AZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for RD33ES-T4-AZ?
For technical support, including RD33ES-T4-AZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RD33ES-T4-AZ requirements.
6.How does Aetrix verify that RD33ES-T4-AZ is sourced from the original manufacturer or authorized distributors?
All RD33ES-T4-AZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that RD33ES-T4-AZ meets industry standards.
7.What is the process for return or replacement of RD33ES-T4-AZ?
All RD33ES-T4-AZ units undergo pre-shipment inspection (PSI). If there is an issue with RD33ES-T4-AZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The RD33ES-T4-AZ part is unused and in its original packaging.
Return procedure for RD33ES-T4-AZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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